Option 1 states that all bases are alkali. This statement is not correct. While all alkalis are bases, not all bases are alkali. Alkalis are a subset of bases that are capable of dissolving in water.

Option 2 states that all alkalis dissolve in water. This statement is correct. Alkalis are water-soluble bases. When alkalis dissolve in water, they produce hydroxide ions (OH-) which gives the solution a basic or alkaline nature. Examples of alkalis that dissolve in water include sodium hydroxide (NaOH) and potassium hydroxide (KOH).

Option 3 states that alkalis are soapy to touch, bitter in taste, and corrosive in nature. This statement is correct. Alkalis have a characteristic slippery or soapy feeling when touched, due to their ability to react with fats and oils. They also have a bitter taste. Additionally, alkalis are corrosive in nature, meaning they can cause damage or destruction to surfaces or living tissues upon contact.

Therefore, the correct answer is Option 3, which states that statement 2 and statement 3 are correct.